Alternatively, it's someone that wrote a solution, re-validated it against the spec, realized it was not fully correct, and was able to correct it within the deadline given. Hiring isn't yet a science.

Orn someone who wrote a massively over engineered spaghetti mess instead of wrapping a block of code in a loop control.

Silver lining: people make mistakes. Especially under stress. You don’t want to work with a group that thinks we are machines.

Perhaps, but if you're given 20 minutes to do something you can do in 2, are you sure you should be making mistakes?